Processing 1.0 - Processing Discourse - question about blend()

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Index › Programming Questions & Help › Syntax Questions › question about blend()

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question about blend() (Read 197 times)

handyaner

question about blend()
Nov 2^nd, 2008, 3:52pm

hello

i tried the blend() function
http://processing.org/reference/blend_.html

background(loadImage("rockies.jpg"));
PImage img = loadImage("degaul.jpg");
image(img, 0, 0);
blend(img, 0, 0, 33, 100, 67, 0, 33, 100, SUBTRACT);

now i have one question.
how big is the image rockies.jpg?
100 x 100 pixel?
33 x 100 pixel?

i get allways the error
background image must be the same size as your application

PhiLho

Re: question about blend()
Reply #1 - Nov 3^rd, 2008, 7:56am

See background() reference page: "An image can also be used as the background for a sketch, however its width and height must be the same size as the sketch window. To resize an image 'b' to the size of the sketch window, use b.resize(width, height)."

Example (using images in my sketchbook folder):
Code:

void setup()
{
  size(600, 600);
  PImage b = loadImage("../Johnson.jpg");
  b.resize(width, height);
  background(b);
  PImage img = loadImage("../Globe.png");  
  image(img, 0, 0);
  blend(img, 0, 0, 33, 100, 67, 0, 33, 100, SUBTRACT); 
}

Or set size() parameters to the size of the image, or use some image viewer/editor to set the image size to the sketch size.

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